defmodule Towerops.Integration.DiscoveryParityTest do
  @moduledoc """
  Integration tests for SNMP discovery/polling parity.

  Runs against a real SNMP device (MikroTik RB5009UG+S+) using the actual
  SnmpKit library (not mocks) and verifies our discovery pipeline captures
  everything that snmpwalk/snmpget returns.

  These tests are excluded from normal `mix test` runs via the :integration tag.
  Run with: mix test test/integration/discovery_parity_test.exs --include integration
  """
  use Towerops.DataCase, async: false

  import Towerops.DevicesFixtures

  alias Towerops.Snmp
  alias Towerops.Snmp.Client
  alias Towerops.Snmp.Discovery
  alias Towerops.Snmp.Profiles.Base
  alias Towerops.Snmp.Profiles.Dynamic

  require Logger

  @moduletag :integration

  # Test device: MikroTik RB5009UG+S+ running RouterOS
  @test_ip "204.110.191.1"
  @test_community "testlocal"
  @test_version "2c"

  @client_opts [
    ip: @test_ip,
    community: @test_community,
    version: @test_version,
    port: 161,
    timeout: 10_000
  ]

  # Standard OIDs for ground truth comparisons
  @sys_uptime_oid "1.3.6.1.2.1.1.3.0"
  @if_index_oid "1.3.6.1.2.1.2.2.1.1"
  @if_descr_oid "1.3.6.1.2.1.2.2.1.2"
  @if_type_oid "1.3.6.1.2.1.2.2.1.3"
  @if_speed_oid "1.3.6.1.2.1.2.2.1.5"
  @if_phys_address_oid "1.3.6.1.2.1.2.2.1.6"
  @if_admin_status_oid "1.3.6.1.2.1.2.2.1.7"
  @if_oper_status_oid "1.3.6.1.2.1.2.2.1.8"
  @if_name_oid "1.3.6.1.2.1.31.1.1.1.1"
  @if_high_speed_oid "1.3.6.1.2.1.31.1.1.1.15"
  @if_alias_oid "1.3.6.1.2.1.31.1.1.1.18"
  @if_in_octets_oid "1.3.6.1.2.1.2.2.1.10"
  @if_out_octets_oid "1.3.6.1.2.1.2.2.1.16"
  @entity_sensor_type_oid "1.3.6.1.2.1.99.1.1.1.1"
  @entity_phys_descr_oid "1.3.6.1.2.1.47.1.1.1.1.2"

  # IP-MIB OIDs
  @ip_ad_ent_addr_oid "1.3.6.1.2.1.4.20.1.1"
  @ip_ad_ent_if_index_oid "1.3.6.1.2.1.4.20.1.2"
  @ip_ad_ent_net_mask_oid "1.3.6.1.2.1.4.20.1.3"

  # HR-MIB OIDs
  @hr_processor_load_oid "1.3.6.1.2.1.25.3.3.1.2"
  @hr_storage_descr_oid "1.3.6.1.2.1.25.2.3.1.3"
  @hr_storage_size_oid "1.3.6.1.2.1.25.2.3.1.5"
  @hr_storage_used_oid "1.3.6.1.2.1.25.2.3.1.6"

  # MikroTik enterprise OIDs
  @mtxr_gauge_name_oid "1.3.6.1.4.1.14988.1.1.3.100.1.2"
  @mtxr_gauge_value_oid "1.3.6.1.4.1.14988.1.1.3.100.1.3"
  @mtxr_serial_oid "1.3.6.1.4.1.14988.1.1.4.1.0"
  @mtxr_firmware_oid "1.3.6.1.4.1.14988.1.1.4.4.0"
  @mtxr_model_oid "1.3.6.1.4.1.14988.1.1.7.8.0"
  @mtxr_dhcp_lease_count_oid "1.3.6.1.4.1.14988.1.1.6.1.0"
  @mtxr_hl_voltage_oid "1.3.6.1.4.1.14988.1.1.3.11.0"

  setup do
    # Override SNMP adapter from mock to real SnmpKit
    original_adapter = Application.get_env(:towerops, :snmp_adapter)
    Application.put_env(:towerops, :snmp_adapter, SnmpKit)

    # Check device connectivity with a quick sysUpTime GET
    reachable =
      case Client.get(@client_opts, @sys_uptime_oid) do
        {:ok, _} ->
          true

        {:error, reason} ->
          Logger.warning("Test device #{@test_ip} unreachable: #{inspect(reason)}")
          false
      end

    on_exit(fn ->
      if original_adapter do
        Application.put_env(:towerops, :snmp_adapter, original_adapter)
      else
        Application.delete_env(:towerops, :snmp_adapter)
      end
    end)

    %{reachable: reachable}
  end

  describe "raw SNMP connectivity" do
    @tag timeout: 30_000
    test "GET sysUpTime.0 returns integer", %{reachable: reachable} do
      skip_unless_reachable(reachable)

      {:ok, uptime} = Client.get(@client_opts, @sys_uptime_oid)
      assert is_integer(uptime), "Expected integer uptime, got: #{inspect(uptime)}"
      assert uptime >= 0
    end

    @tag timeout: 60_000
    test "WALK ifIndex returns non-empty results", %{reachable: reachable} do
      skip_unless_reachable(reachable)

      {:ok, results} = Client.walk(@client_opts, @if_index_oid)
      assert map_size(results) > 0, "Expected at least one interface"

      for {_oid, value} <- results do
        assert is_integer(value) and value > 0,
               "ifIndex values must be positive integers, got: #{inspect(value)}"
      end
    end
  end

  describe "system info parity" do
    @tag timeout: 60_000
    test "discover_system_info returns all SNMPv2-MIB fields", %{reachable: reachable} do
      skip_unless_reachable(reachable)

      {:ok, system_info} = Base.discover_system_info(@client_opts)

      # All 6 standard system fields should be present and populated
      assert String.length(system_info.sys_descr) > 0

      assert String.starts_with?(system_info.sys_object_id, "1.3.6.1")

      assert String.length(system_info.sys_name) > 0

      assert is_integer(system_info.sys_uptime)
      assert system_info.sys_uptime >= 0

      # Contact and location should be present (may be empty strings)
      assert Map.has_key?(system_info, :sys_contact)
      assert Map.has_key?(system_info, :sys_location)

      Logger.info(
        "System: descr=#{String.slice(system_info.sys_descr, 0..80)}, " <>
          "name=#{system_info.sys_name}, oid=#{system_info.sys_object_id}, " <>
          "contact=#{system_info.sys_contact}, location=#{system_info.sys_location}"
      )
    end

    @tag timeout: 60_000
    test "raw SNMP values match discovery output", %{reachable: reachable} do
      skip_unless_reachable(reachable)

      {:ok, raw_descr} = Client.get(@client_opts, "1.3.6.1.2.1.1.1.0")
      {:ok, raw_name} = Client.get(@client_opts, "1.3.6.1.2.1.1.5.0")
      {:ok, raw_contact} = Client.get(@client_opts, "1.3.6.1.2.1.1.4.0")
      {:ok, raw_location} = Client.get(@client_opts, "1.3.6.1.2.1.1.6.0")
      {:ok, raw_object_id} = Client.get(@client_opts, "1.3.6.1.2.1.1.2.0")

      {:ok, system_info} = Base.discover_system_info(@client_opts)

      assert byte_size(raw_descr) > 0
      assert byte_size(system_info.sys_descr) > 0
      assert system_info.sys_name == to_string(raw_name)

      # sysObjectID comes as OID list from raw SNMP, discovery converts to dotted string
      valid? = is_list(raw_object_id) or is_binary(raw_object_id)
      assert valid?
      assert String.starts_with?(system_info.sys_object_id, "1.3.6.1")

      # Contact and location should match raw values
      assert system_info.sys_contact == to_string(raw_contact)
      assert system_info.sys_location == to_string(raw_location)
    end
  end

  describe "profile selection" do
    @tag timeout: 60_000
    test "selects RouterOS YAML profile for MikroTik device", %{reachable: reachable} do
      skip_unless_reachable(reachable)

      {:ok, system_info} = Base.discover_system_info(@client_opts)
      profile = Discovery.select_profile(system_info, @client_opts)

      # This device has sysObjectID .1.3.6.1.4.1.14988.1 which should match routeros profile
      assert match?({:yaml, %{name: _}}, profile),
             "Expected YAML profile match for MikroTik device, got: #{inspect(profile)}"

      {:yaml, yaml_profile} = profile
      Logger.info("Selected YAML profile: #{yaml_profile.name}")

      # Verify profile has sensor definitions (routeros.yaml has temperature, voltage, etc.)
      # credo:disable-for-next-line Jump.CredoChecks.ConditionalAssertion
      assert Map.has_key?(yaml_profile, :sensors) or Map.has_key?(yaml_profile, :table_sensor_oids),
             "RouterOS profile should have sensor definitions"
    end
  end

  describe "interface discovery parity" do
    @tag timeout: 120_000
    test "interface count matches raw ifIndex walk", %{reachable: reachable} do
      skip_unless_reachable(reachable)

      {:ok, raw_if_indices} = Client.walk(@client_opts, @if_index_oid)
      expected_count = map_size(raw_if_indices)

      {:ok, interfaces} = Base.discover_interfaces(@client_opts)

      assert length(interfaces) == expected_count,
             "Discovery found #{length(interfaces)} interfaces, " <>
               "raw walk found #{expected_count}"

      Logger.info("Interface count matches: #{expected_count}")
    end

    @tag timeout: 120_000
    test "ifIndex values match raw walk exactly", %{reachable: reachable} do
      skip_unless_reachable(reachable)

      {:ok, raw_if_indices} = Client.walk(@client_opts, @if_index_oid)
      {:ok, interfaces} = Base.discover_interfaces(@client_opts)

      raw_indices = raw_if_indices |> Map.values() |> MapSet.new()
      discovered_indices = MapSet.new(interfaces, & &1.if_index)

      assert MapSet.equal?(raw_indices, discovered_indices),
             "ifIndex mismatch - raw: #{inspect(MapSet.to_list(raw_indices))}, " <>
               "discovered: #{inspect(MapSet.to_list(discovered_indices))}"
    end

    @tag timeout: 120_000
    test "all ifTable fields populated per interface", %{reachable: reachable} do
      skip_unless_reachable(reachable)

      # Get raw ground truth for all standard IF-MIB fields
      {:ok, raw_descrs} = Client.walk(@client_opts, @if_descr_oid)
      {:ok, raw_types} = Client.walk(@client_opts, @if_type_oid)
      {:ok, raw_admin} = Client.walk(@client_opts, @if_admin_status_oid)
      {:ok, raw_oper} = Client.walk(@client_opts, @if_oper_status_oid)

      {:ok, interfaces} = Base.discover_interfaces(@client_opts)

      # Count matches for all fields
      assert length(interfaces) == map_size(raw_descrs),
             "ifDescr count mismatch: #{length(interfaces)} vs #{map_size(raw_descrs)}"

      assert length(interfaces) == map_size(raw_types),
             "ifType count mismatch: #{length(interfaces)} vs #{map_size(raw_types)}"

      assert length(interfaces) == map_size(raw_admin),
             "ifAdminStatus count mismatch: #{length(interfaces)} vs #{map_size(raw_admin)}"

      assert length(interfaces) == map_size(raw_oper),
             "ifOperStatus count mismatch: #{length(interfaces)} vs #{map_size(raw_oper)}"

      for iface <- interfaces do
        # ifDescr must be present on every interface
        assert is_binary(iface.if_descr),
               "Interface #{iface.if_index} missing if_descr"

        assert String.length(iface.if_descr) > 0,
               "Interface #{iface.if_index} has empty if_descr"

        # ifType must be a positive integer (IANAifType)
        assert is_integer(iface.if_type) and iface.if_type > 0,
               "Interface #{iface.if_index} invalid ifType: #{inspect(iface.if_type)}"

        # Admin/oper status - device returns string atoms or integers
        valid_admin = [1, 2, 3, "up", "down", "testing"]

        valid_oper = [
          1,
          2,
          3,
          4,
          5,
          6,
          7,
          "up",
          "down",
          "testing",
          "unknown",
          "dormant",
          "notPresent",
          "lowerLayerDown"
        ]

        assert iface.if_admin_status in valid_admin,
               "Interface #{iface.if_index} invalid admin status: #{inspect(iface.if_admin_status)}"

        assert iface.if_oper_status in valid_oper,
               "Interface #{iface.if_index} invalid oper status: #{inspect(iface.if_oper_status)}"
      end
    end

    @tag timeout: 120_000
    test "ifXTable extended fields populated", %{reachable: reachable} do
      skip_unless_reachable(reachable)

      # Ground truth for ifXTable
      {:ok, raw_names} = Client.walk(@client_opts, @if_name_oid)
      {:ok, raw_aliases} = Client.walk(@client_opts, @if_alias_oid)
      {:ok, raw_high_speed} = Client.walk(@client_opts, @if_high_speed_oid)
      {:ok, raw_speeds} = Client.walk(@client_opts, @if_speed_oid)

      {:ok, interfaces} = Base.discover_interfaces(@client_opts)

      # ifName should be discovered for all interfaces
      assert map_size(raw_names) == length(interfaces),
             "Raw ifName count (#{map_size(raw_names)}) != interface count (#{length(interfaces)})"

      interfaces_with_name = Enum.count(interfaces, & &1[:if_name])

      Logger.info(
        "ifXTable: #{interfaces_with_name}/#{length(interfaces)} have ifName, " <>
          "#{map_size(raw_aliases)} have ifAlias, " <>
          "#{map_size(raw_high_speed)} have ifHighSpeed, " <>
          "#{map_size(raw_speeds)} have ifSpeed"
      )

      assert interfaces_with_name == map_size(raw_names),
             "Discovery missed #{map_size(raw_names) - interfaces_with_name} ifName entries"

      # Verify ifPhysAddress (MAC address) is populated where available
      {:ok, raw_macs} = Client.walk(@client_opts, @if_phys_address_oid)

      interfaces_with_mac =
        Enum.count(interfaces, fn iface ->
          iface[:if_phys_address] != nil and iface[:if_phys_address] != ""
        end)

      # Count non-empty MACs from raw walk (PPP interfaces have empty MACs)
      raw_nonempty_macs =
        Enum.count(raw_macs, fn {_oid, val} ->
          val != "" and val != nil and val != <<0, 0, 0, 0, 0, 0>>
        end)

      Logger.info("MAC addresses: #{interfaces_with_mac} discovered, #{raw_nonempty_macs} non-empty in raw walk")
    end
  end

  describe "sensor discovery parity" do
    @tag timeout: 120_000
    test "ENTITY-SENSOR-MIB sensor count matches raw walk", %{reachable: reachable} do
      skip_unless_reachable(reachable)

      case Client.walk(@client_opts, @entity_sensor_type_oid) do
        {:ok, raw_sensors} when map_size(raw_sensors) > 0 ->
          expected_count = map_size(raw_sensors)
          {:ok, sensors} = Base.discover_sensors(@client_opts)

          Logger.info("ENTITY-SENSOR-MIB: raw=#{expected_count}, discovered=#{length(sensors)}")

          assert length(sensors) == expected_count,
                 "Sensor count mismatch: raw=#{expected_count}, discovered=#{length(sensors)}"

        {:ok, raw_sensors} when map_size(raw_sensors) == 0 ->
          Logger.info("Device has no ENTITY-SENSOR-MIB sensors (expected for MikroTik)")
          {:ok, sensors} = Base.discover_sensors(@client_opts)
          assert sensors == []

        {:error, _reason} ->
          Logger.info("ENTITY-SENSOR-MIB not supported (expected for MikroTik)")
          {:ok, _sensors} = Base.discover_sensors(@client_opts)
      end
    end

    @tag timeout: 120_000
    test "MikroTik gauge sensors discovered via YAML profile", %{reachable: reachable} do
      skip_unless_reachable(reachable)

      # Ground truth: raw MikroTik gauge table
      {:ok, raw_gauge_names} = Client.walk(@client_opts, @mtxr_gauge_name_oid)
      {:ok, raw_gauge_values} = Client.walk(@client_opts, @mtxr_gauge_value_oid)

      Logger.info(
        "Raw MikroTik gauges: #{map_size(raw_gauge_names)} names, " <>
          "#{map_size(raw_gauge_values)} values"
      )

      for {oid, name} <- raw_gauge_names do
        index = oid |> String.split(".") |> List.last()
        value_oid = @mtxr_gauge_value_oid <> ".#{index}"
        value = Map.get(raw_gauge_values, value_oid)
        Logger.info("  Gauge #{index}: name=#{inspect(name)}, value=#{inspect(value)}")
      end

      # Now check that YAML profile discovery finds these
      {:ok, system_info} = Base.discover_system_info(@client_opts)
      profile = Discovery.select_profile(system_info, @client_opts)

      assert match?({:yaml, _}, profile), "Expected YAML profile for MikroTik"
      {:yaml, yaml_profile} = profile

      {:ok, yaml_sensors} = Dynamic.discover_sensors(yaml_profile, @client_opts)

      # Log all discovered sensors for comparison
      Logger.info("YAML profile discovered #{length(yaml_sensors)} sensors:")

      for sensor <- yaml_sensors do
        Logger.info(
          "  #{sensor.sensor_type}/#{sensor.sensor_index}: " <>
            "#{sensor.sensor_descr} = #{inspect(sensor[:last_value])} " <>
            "(oid=#{sensor.sensor_oid}, unit=#{sensor.sensor_unit}, div=#{sensor.sensor_divisor})"
        )
      end

      # MikroTik gauges should produce at least one temperature sensor
      temp_sensors = Enum.filter(yaml_sensors, &(&1.sensor_type == "temperature"))

      assert temp_sensors != [],
             "Expected MikroTik temperature sensors (mtxrGaugeTable has cpu-temperature)"

      # Verify raw gauge value matches a discovered sensor
      if map_size(raw_gauge_names) > 0 do
        gauge_sensor_oids =
          yaml_sensors
          |> Enum.map(& &1.sensor_oid)
          |> Enum.filter(&String.contains?(&1, "14988.1.1.3.100"))

        assert gauge_sensor_oids != [],
               "Expected sensors from mtxrGaugeTable (1.3.6.1.4.1.14988.1.1.3.100)"
      end
    end

    @tag timeout: 120_000
    test "MikroTik voltage sensors discovered", %{reachable: reachable} do
      skip_unless_reachable(reachable)

      # Raw voltage value
      case Client.get(@client_opts, @mtxr_hl_voltage_oid) do
        {:ok, raw_voltage} ->
          Logger.info("Raw mtxrHlVoltage: #{inspect(raw_voltage)}")

          {:ok, system_info} = Base.discover_system_info(@client_opts)
          {:yaml, yaml_profile} = Discovery.select_profile(system_info, @client_opts)
          {:ok, sensors} = Dynamic.discover_sensors(yaml_profile, @client_opts)

          voltage_sensors = Enum.filter(sensors, &(&1.sensor_type == "voltage"))

          Logger.info("Voltage sensors discovered: #{length(voltage_sensors)}")

          for vs <- voltage_sensors do
            Logger.info("  #{vs.sensor_descr}: value=#{inspect(vs[:last_value])}, oid=#{vs.sensor_oid}")
          end

          assert voltage_sensors != [], "Expected voltage sensors from MikroTik"

        {:error, reason} ->
          Logger.warning("mtxrHlVoltage not available: #{inspect(reason)}")
      end
    end

    @tag timeout: 120_000
    test "MikroTik count sensors discovered (DHCP, firewall)", %{reachable: reachable} do
      skip_unless_reachable(reachable)

      # Check raw DHCP lease count
      case Client.get(@client_opts, @mtxr_dhcp_lease_count_oid) do
        {:ok, raw_dhcp} ->
          Logger.info("Raw mtxrDHCPLeaseCount: #{inspect(raw_dhcp)}")

        {:error, reason} ->
          Logger.warning("mtxrDHCPLeaseCount not available: #{inspect(reason)}")
      end

      {:ok, system_info} = Base.discover_system_info(@client_opts)
      {:yaml, yaml_profile} = Discovery.select_profile(system_info, @client_opts)
      {:ok, sensors} = Dynamic.discover_sensors(yaml_profile, @client_opts)

      count_sensors = Enum.filter(sensors, &(&1.sensor_type == "count"))

      Logger.info("Count sensors discovered: #{length(count_sensors)}")

      for cs <- count_sensors do
        Logger.info("  #{cs.sensor_descr}: value=#{inspect(cs[:last_value])}, oid=#{cs.sensor_oid}")
      end

      # MikroTik should have DHCP lease count and/or firewall connection counts
      assert count_sensors != [],
             "Expected count sensors (DHCP leases, firewall connections)"
    end

    @tag timeout: 120_000
    test "all discovered sensor fields have valid types", %{reachable: reachable} do
      skip_unless_reachable(reachable)

      {:ok, system_info} = Base.discover_system_info(@client_opts)
      profile = Discovery.select_profile(system_info, @client_opts)

      sensors =
        case profile do
          {:yaml, yaml_profile} ->
            {:ok, s} = Dynamic.discover_sensors(yaml_profile, @client_opts)
            s

          Base ->
            {:ok, s} = Base.discover_sensors(@client_opts)
            s
        end

      for sensor <- sensors do
        assert is_binary(sensor.sensor_type), "sensor_type must be string: #{inspect(sensor)}"
        assert is_binary(sensor.sensor_index), "sensor_index must be string: #{inspect(sensor)}"
        assert is_binary(sensor.sensor_oid), "sensor_oid must be string: #{inspect(sensor)}"

        # credo:disable-for-next-line Jump.CredoChecks.ConditionalAssertion
        assert String.starts_with?(sensor.sensor_oid, "1.3.6.1") or
                 String.starts_with?(sensor.sensor_oid, ".1.3.6.1"),
               "sensor_oid must be valid OID: #{sensor.sensor_oid}"

        assert is_binary(sensor.sensor_descr), "sensor_descr must be string: #{inspect(sensor)}"
        assert is_binary(sensor.sensor_unit), "sensor_unit must be string: #{inspect(sensor)}"
        assert is_number(sensor.sensor_divisor), "sensor_divisor must be number: #{inspect(sensor)}"
        assert sensor.sensor_divisor > 0, "sensor_divisor must be positive: #{sensor.sensor_divisor}"
      end

      # Log sensor type breakdown
      by_type = Enum.group_by(sensors, & &1.sensor_type)

      for {type, group} <- by_type do
        Logger.info("  #{type}: #{length(group)} sensors")
      end

      Logger.info("Validated #{length(sensors)} sensors across #{map_size(by_type)} types")
    end
  end

  describe "device identification parity" do
    @tag timeout: 120_000
    test "MikroTik-specific OIDs provide serial, firmware, model", %{reachable: reachable} do
      skip_unless_reachable(reachable)

      # Raw ground truth from MikroTik enterprise OIDs
      {:ok, raw_serial} = Client.get(@client_opts, @mtxr_serial_oid)
      {:ok, raw_firmware} = Client.get(@client_opts, @mtxr_firmware_oid)
      {:ok, raw_model} = Client.get(@client_opts, @mtxr_model_oid)

      Logger.info(
        "Raw MikroTik: serial=#{inspect(raw_serial)}, " <>
          "firmware=#{inspect(raw_firmware)}, model=#{inspect(raw_model)}"
      )

      assert is_binary(raw_serial) and String.length(raw_serial) > 0
      assert is_binary(raw_firmware) and String.length(raw_firmware) > 0
      assert is_binary(raw_model) and String.length(raw_model) > 0

      # Now verify discovery captures these
      {:ok, system_info} = Base.discover_system_info(@client_opts)
      {:yaml, yaml_profile} = Discovery.select_profile(system_info, @client_opts)
      device_info = Dynamic.identify_device(yaml_profile, @client_opts, system_info)

      Logger.info(
        "Discovery device_info: manufacturer=#{inspect(device_info[:manufacturer])}, " <>
          "model=#{inspect(device_info[:model])}, " <>
          "firmware=#{inspect(device_info[:firmware_version])}, " <>
          "serial=#{inspect(device_info[:serial_number])}"
      )

      assert byte_size(device_info.manufacturer) > 0
      assert byte_size(device_info.model) > 0

      # Serial and firmware should come from MikroTik-specific OIDs
      if device_info[:serial_number] do
        assert String.length(device_info.serial_number) > 0
        Logger.info("Serial number captured: #{device_info.serial_number}")
      else
        Logger.warning("Serial number NOT captured from MikroTik OIDs (parity gap)")
      end

      if device_info[:firmware_version] do
        assert String.length(device_info.firmware_version) > 0
        Logger.info("Firmware version captured: #{device_info.firmware_version}")
      else
        Logger.warning("Firmware version NOT captured from MikroTik OIDs (parity gap)")
      end
    end
  end

  describe "ENTITY-MIB physical entities" do
    @tag timeout: 120_000
    test "physical entity descriptions discovered", %{reachable: reachable} do
      skip_unless_reachable(reachable)

      {:ok, raw_entities} = Client.walk(@client_opts, @entity_phys_descr_oid)

      Logger.info("ENTITY-MIB physical entities: #{map_size(raw_entities)}")

      for {oid, descr} <- raw_entities do
        index = oid |> String.split(".") |> List.last()
        Logger.info("  Entity #{index}: #{inspect(descr)}")
      end

      # Verify our discovery can read these too
      {:ok, entities} = Base.discover_physical_entities(@client_opts)
      refute Enum.empty?(entities)

      Logger.info("Discovery found #{length(entities)} physical entities")

      # MikroTik has ENTITY-MIB entries (RouterOS info, USB controllers, etc.)
      if map_size(raw_entities) > 0 do
        assert entities != [],
               "Expected physical entities - raw walk found #{map_size(raw_entities)}"
      end
    end
  end

  describe "secondary discovery parity" do
    @tag timeout: 120_000
    test "VLANs from Q-BRIDGE-MIB", %{reachable: reachable} do
      skip_unless_reachable(reachable)

      {:ok, vlans} = Base.discover_vlans(@client_opts)
      refute Enum.empty?(vlans)

      Logger.info("Discovered #{length(vlans)} VLANs (MikroTik typically returns 0)")
    end

    @tag timeout: 120_000
    test "IP addresses match raw IP-MIB walk", %{reachable: reachable} do
      skip_unless_reachable(reachable)

      # Raw ground truth
      {:ok, raw_ip_addrs} = Client.walk(@client_opts, @ip_ad_ent_addr_oid)
      {:ok, raw_ip_if_index} = Client.walk(@client_opts, @ip_ad_ent_if_index_oid)
      {:ok, raw_ip_masks} = Client.walk(@client_opts, @ip_ad_ent_net_mask_oid)

      Logger.info(
        "Raw IP-MIB: #{map_size(raw_ip_addrs)} addresses, " <>
          "#{map_size(raw_ip_if_index)} if-indices, #{map_size(raw_ip_masks)} netmasks"
      )

      for {oid, addr} <- raw_ip_addrs do
        index = String.replace_prefix(oid, "1.3.6.1.2.1.4.20.1.1.", "")
        if_idx_oid = "1.3.6.1.2.1.4.20.1.2.#{index}"
        mask_oid = "1.3.6.1.2.1.4.20.1.3.#{index}"
        if_idx = Map.get(raw_ip_if_index, if_idx_oid)
        mask = Map.get(raw_ip_masks, mask_oid)
        Logger.info("  #{inspect(addr)} (ifIndex=#{inspect(if_idx)}, mask=#{inspect(mask)})")
      end

      # Discovery output
      {:ok, ip_addresses} = Base.discover_all_ip_addresses(@client_opts)

      # Should discover at least as many IPs as raw walk
      assert length(ip_addresses) >= map_size(raw_ip_addrs),
             "Discovery found #{length(ip_addresses)} IPs, raw walk found #{map_size(raw_ip_addrs)}"

      # Target IP must be among discovered addresses
      all_ips = Enum.map(ip_addresses, & &1[:ip_address])

      Logger.info("Discovered IPs: #{inspect(all_ips)}")

      assert @test_ip in all_ips,
             "Target IP #{@test_ip} not found among discovered IPs: #{inspect(all_ips)}"
    end

    @tag timeout: 120_000
    test "processors match raw HR-MIB walk", %{reachable: reachable} do
      skip_unless_reachable(reachable)

      {:ok, raw_proc_loads} = Client.walk(@client_opts, @hr_processor_load_oid)

      Logger.info("Raw HR-MIB processors: #{map_size(raw_proc_loads)}")

      for {oid, load} <- raw_proc_loads do
        index = oid |> String.split(".") |> List.last()
        Logger.info("  Processor #{index}: load=#{load}%")
      end

      {:ok, processors} = Base.discover_processors(@client_opts)

      # Count should match raw walk
      assert length(processors) == map_size(raw_proc_loads),
             "Processor count mismatch: discovered=#{length(processors)}, " <>
               "raw=#{map_size(raw_proc_loads)}"

      for proc <- processors do
        if proc[:load] do
          assert is_number(proc.load)

          assert proc.load >= 0 and proc.load <= 100,
                 "CPU load out of range: #{proc.load}"
        end
      end

      Logger.info("Discovered #{length(processors)} processors (matches raw walk)")
    end

    @tag timeout: 120_000
    test "storage matches raw HR-MIB walk (disk types only)", %{reachable: reachable} do
      skip_unless_reachable(reachable)

      # Raw HR-MIB includes ALL storage types: RAM, FixedDisk, Other, etc.
      {:ok, raw_storage_descr} = Client.walk(@client_opts, @hr_storage_descr_oid)
      {:ok, raw_storage_size} = Client.walk(@client_opts, @hr_storage_size_oid)
      {:ok, raw_storage_used} = Client.walk(@client_opts, @hr_storage_used_oid)
      {:ok, raw_storage_types} = Client.walk(@client_opts, "1.3.6.1.2.1.25.2.3.1.2")

      Logger.info("Raw HR-MIB storage entries (all types): #{map_size(raw_storage_descr)}")

      # Disk-type OIDs that discover_storage keeps (RAM and Other are filtered out)
      disk_type_oids = [
        # fixedDisk
        [1, 3, 6, 1, 2, 1, 25, 2, 1, 4],
        # removableDisk
        [1, 3, 6, 1, 2, 1, 25, 2, 1, 5],
        # floppyDisk
        [1, 3, 6, 1, 2, 1, 25, 2, 1, 6],
        # compactDisc
        [1, 3, 6, 1, 2, 1, 25, 2, 1, 7],
        # ramDisk
        [1, 3, 6, 1, 2, 1, 25, 2, 1, 8],
        # flashMemory
        [1, 3, 6, 1, 2, 1, 25, 2, 1, 9],
        # networkDisk
        [1, 3, 6, 1, 2, 1, 25, 2, 1, 10]
      ]

      raw_disk_count =
        Enum.count(raw_storage_types, fn {_oid, type_val} ->
          type_val in disk_type_oids
        end)

      for {oid, descr} <- raw_storage_descr do
        index = oid |> String.split(".") |> List.last()
        type_oid = "1.3.6.1.2.1.25.2.3.1.2.#{index}"
        size_oid = "1.3.6.1.2.1.25.2.3.1.5.#{index}"
        used_oid = "1.3.6.1.2.1.25.2.3.1.6.#{index}"
        type_val = Map.get(raw_storage_types, type_oid)
        is_disk = type_val in disk_type_oids
        size = Map.get(raw_storage_size, size_oid)
        used = Map.get(raw_storage_used, used_oid)

        Logger.info(
          "  #{inspect(descr)}: type=#{inspect(type_val)}, disk=#{is_disk}, " <>
            "size=#{inspect(size)}, used=#{inspect(used)}"
        )
      end

      {:ok, storage} = Base.discover_storage(@client_opts)

      # discover_storage only returns disk-type entries (not RAM or Other)
      assert length(storage) == raw_disk_count,
             "Storage count mismatch: discovered=#{length(storage)}, " <>
               "raw disk-type=#{raw_disk_count} (total raw=#{map_size(raw_storage_descr)})"

      for entry <- storage do
        assert entry[:total_bytes] != nil, "Storage entry missing total_bytes"
        assert is_number(entry.total_bytes)
        assert entry.total_bytes >= 0
      end

      Logger.info(
        "Discovered #{length(storage)} disk storage entries (raw has #{raw_disk_count} disk, #{map_size(raw_storage_descr)} total)"
      )
    end
  end

  describe "full discovery pipeline" do
    @tag timeout: 300_000
    test "discover_device saves complete data to DB", %{reachable: reachable} do
      skip_unless_reachable(reachable)

      device =
        device_fixture(%{
          ip_address: @test_ip,
          snmp_enabled: true,
          snmp_version: @test_version,
          snmp_community: @test_community,
          snmp_port: 161
        })

      {:ok, snmp_device} = Discovery.discover_device(device)

      # Verify SNMP device record has all fields
      assert snmp_device.id
      assert byte_size(snmp_device.sys_descr) > 0
      assert byte_size(snmp_device.sys_object_id) > 0
      assert byte_size(snmp_device.sys_name) > 0
      assert byte_size(snmp_device.manufacturer) > 0
      assert byte_size(snmp_device.model) > 0
      assert snmp_device.last_discovery_at

      Logger.info(
        "Discovery: manufacturer=#{snmp_device.manufacturer}, " <>
          "model=#{snmp_device.model}, firmware=#{snmp_device.firmware_version}, " <>
          "serial=#{snmp_device.serial_number}"
      )

      # Verify interfaces persisted and match raw walk count
      interfaces = Snmp.list_interfaces(snmp_device.id)
      {:ok, raw_if_indices} = Client.walk(@client_opts, @if_index_oid)

      assert length(interfaces) == map_size(raw_if_indices),
             "Persisted #{length(interfaces)} interfaces, raw walk has #{map_size(raw_if_indices)}"

      Logger.info("Persisted #{length(interfaces)} interfaces (matches raw walk)")

      # Verify sensors persisted (MikroTik should have profile-specific sensors)
      sensors = Snmp.list_sensors(snmp_device.id)

      Logger.info("Persisted #{length(sensors)} sensors")

      if sensors != [] do
        by_type = Enum.group_by(sensors, & &1.sensor_type)

        for {type, group} <- by_type do
          Logger.info("  #{type}: #{length(group)} sensors")

          for s <- group do
            Logger.info("    #{s.sensor_descr} (#{s.sensor_oid})")
          end
        end
      end

      # Verify processors persisted
      processors = Snmp.list_processors(snmp_device.id)
      {:ok, raw_proc} = Client.walk(@client_opts, @hr_processor_load_oid)

      assert length(processors) == map_size(raw_proc),
             "Persisted #{length(processors)} processors, raw walk has #{map_size(raw_proc)}"

      Logger.info("Persisted #{length(processors)} processors (matches raw walk)")

      # Verify storage persisted (only disk-type entries, not RAM/Other)
      storage = Snmp.list_storage(snmp_device.id)
      refute Enum.empty?(storage), "Expected at least one disk storage entry"

      Logger.info("Persisted #{length(storage)} disk storage entries")

      # Verify IP addresses persisted
      ip_addresses = Snmp.list_ip_addresses(snmp_device.id)
      {:ok, raw_ips} = Client.walk(@client_opts, @ip_ad_ent_addr_oid)

      Logger.info("Persisted #{length(ip_addresses)} IP addresses (raw walk has #{map_size(raw_ips)})")
    end

    @tag timeout: 300_000
    test "rediscovery updates without creating duplicates", %{reachable: reachable} do
      skip_unless_reachable(reachable)

      device =
        device_fixture(%{
          ip_address: @test_ip,
          snmp_enabled: true,
          snmp_version: @test_version,
          snmp_community: @test_community,
          snmp_port: 161
        })

      # First discovery
      {:ok, snmp_device_1} = Discovery.discover_device(device)
      interfaces_1 = Snmp.list_interfaces(snmp_device_1.id)
      sensors_1 = Snmp.list_sensors(snmp_device_1.id)
      processors_1 = Snmp.list_processors(snmp_device_1.id)
      storage_1 = Snmp.list_storage(snmp_device_1.id)

      # Second discovery (should update, not duplicate)
      {:ok, snmp_device_2} = Discovery.discover_device(device)
      interfaces_2 = Snmp.list_interfaces(snmp_device_2.id)
      sensors_2 = Snmp.list_sensors(snmp_device_2.id)
      processors_2 = Snmp.list_processors(snmp_device_2.id)
      storage_2 = Snmp.list_storage(snmp_device_2.id)

      # Same SNMP device record (upserted, not duplicated)
      assert snmp_device_1.id == snmp_device_2.id

      # Same counts (synced, not appended)
      assert length(interfaces_1) == length(interfaces_2),
             "Interface count changed: #{length(interfaces_1)} -> #{length(interfaces_2)}"

      assert length(sensors_1) == length(sensors_2),
             "Sensor count changed: #{length(sensors_1)} -> #{length(sensors_2)}"

      assert length(processors_1) == length(processors_2),
             "Processor count changed: #{length(processors_1)} -> #{length(processors_2)}"

      assert length(storage_1) == length(storage_2),
             "Storage count changed: #{length(storage_1)} -> #{length(storage_2)}"

      Logger.info(
        "Rediscovery preserved: #{length(interfaces_2)} interfaces, " <>
          "#{length(sensors_2)} sensors, #{length(processors_2)} processors, " <>
          "#{length(storage_2)} storage"
      )
    end
  end

  describe "polling after discovery" do
    @tag timeout: 300_000
    test "sensor OIDs return numeric values after discovery", %{reachable: reachable} do
      skip_unless_reachable(reachable)

      device =
        device_fixture(%{
          ip_address: @test_ip,
          snmp_enabled: true,
          snmp_version: @test_version,
          snmp_community: @test_community,
          snmp_port: 161
        })

      {:ok, snmp_device} = Discovery.discover_device(device)
      sensors = Snmp.list_sensors(snmp_device.id)

      if Enum.empty?(sensors) do
        Logger.warning("No sensors to poll - skipping sensor polling test")
      else
        # Poll each sensor's OID and verify we get a readable value
        results =
          Enum.map(sensors, fn sensor ->
            case Client.get(@client_opts, sensor.sensor_oid) do
              {:ok, value} when is_number(value) ->
                {:numeric, sensor.sensor_descr, value}

              {:ok, value} ->
                {:non_numeric, sensor.sensor_descr, value}

              {:error, reason} ->
                {:error, sensor.sensor_descr, reason}
            end
          end)

        numeric = Enum.count(results, &(elem(&1, 0) == :numeric))
        non_numeric = Enum.count(results, &(elem(&1, 0) == :non_numeric))
        errors = Enum.count(results, &(elem(&1, 0) == :error))

        Logger.info(
          "Polled #{length(sensors)} sensors: " <>
            "#{numeric} numeric, #{non_numeric} non-numeric, #{errors} errors"
        )

        for {status, descr, val} <- results do
          Logger.info("  [#{status}] #{descr}: #{inspect(val)}")
        end

        assert numeric > 0, "Expected at least one sensor to return numeric data"
      end
    end

    @tag timeout: 120_000
    test "interface counters (ifInOctets/ifOutOctets) are readable", %{reachable: reachable} do
      skip_unless_reachable(reachable)

      {:ok, in_octets} = Client.walk(@client_opts, @if_in_octets_oid)
      {:ok, out_octets} = Client.walk(@client_opts, @if_out_octets_oid)

      assert map_size(in_octets) > 0, "Expected ifInOctets data"
      assert map_size(out_octets) > 0, "Expected ifOutOctets data"

      # Counter values should be non-negative integers
      for {oid, value} <- in_octets do
        assert is_integer(value) and value >= 0,
               "ifInOctets #{oid} invalid: #{inspect(value)}"
      end

      for {oid, value} <- out_octets do
        assert is_integer(value) and value >= 0,
               "ifOutOctets #{oid} invalid: #{inspect(value)}"
      end

      Logger.info("Interface counters: #{map_size(in_octets)} in, #{map_size(out_octets)} out")
    end
  end

  # Helper to skip tests when device is unreachable.
  defp skip_unless_reachable(true), do: :ok

  defp skip_unless_reachable(false) do
    flunk("Device #{@test_ip} unreachable - skipping")
  end
end